body {
    width: 100%;
    color: #747474;
    line-height: 2.27;
    font-weight: 400;
}

#air {
    width: 100%;
    height: 131px;
}

// 导航栏模块
.nav {
    width: 100%;
    height: 807px;
    background: url("../img/hd-bg.jpg") no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;

    .nav_title {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        color: #ffffff;
        text-align: center;
        letter-spacing: 2px;

        :nth-child(1) {
            font-size: 80px;
            line-height: 96px;
            font-weight: 700;
        }

        :nth-child(2) {
            margin-top: 27px;
            font-size: 34px;
            line-height: 40px;
            font-weight: 700;
        }

        .button {
            margin: auto;
            height: 93.016px;
            display: flex;
            flex-direction: row;
            align-items: flex-end;

            :nth-child(1) :hover {
                background: #ff6600;
                color: #333;
                transition: .3s;
            }

            :nth-child(2) :hover {
                background: #333333;
                color: #ff6600;
                transition: .3s;
            }

            .more {
                width: 80px;
                height: 21px;
                padding: 17px 40px;
                margin-left: 20px;
                background: #333;
                color: #ffffff;
                font-size: 18px;
                font-weight: 400;
                display: flex;
                align-items: center;


            }

            .about {
                width: 80px;
                height: 21px;
                background: #ff6600;
                padding: 17px 40px;
                margin-left: 20px;
                font-size: 18px;
                color: #ffffff;
                font-weight: 400;
                display: flex;
                align-items: center;


            }



        }





    }
}



// 第一部分
.section-01 {
    .title {
        margin: auto;
        padding: 55.281px 30px 40px 30px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        :nth-child(1) {
            margin-bottom: 16px;
            height: 41px;
            line-height: 41px;
            font-size: 32px;
            color: #333;
        }

        :nth-child(2) {
            margin-bottom: 20px;
            height: 34px;
            line-height: 34px;
            font-size: 15px;
        }

        :nth-child(3) {
            margin-bottom: 30px;
            width: 206px;
            border-bottom: 2px solid #ff6600;
        }
    }

    .container {
        margin: auto;
        padding: 0 147.438px 0 147.438px;
        display: flex;
        justify-content: center;



        ul {
            width: 1040px;
            padding: 0 145.750px 80px 145.750px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;

            li {
                position: relative;
                margin: 0 15px 346px 15px;
                padding: 27px 20px;
                width: 266.734px;
                border-radius: 10px;
                text-align: center;

                &:hover {

                    .front,
                    .back {
                        transform: rotateY(180deg);
                    }


                }

                .front,
                .back {
                    position: absolute;
                    top: 0;
                    left: 0;
                    margin: 0 15px 40px 15px;
                    padding: 27px 20px;
                    width: 266.734px;
                    height: 320px;
                    border-radius: 10px;
                    transition: all .5s;
                    display: flex;
                    flex-direction: column;
                }

                .front {
                    z-index: 1;
                    backface-visibility: hidden;
                    background-color: rgb(245, 245, 245);
                    display: flex;
                    flex-direction: column;
                    justify-content: center;
                    align-items: center;

                    img {
                        width: 220px;
                    }

                    :nth-child(2) {
                        margin-bottom: 9px;
                        height: 41px;
                        line-height: 41px;
                        font-size: 32px;
                        color: #333;
                    }

                    :nth-child(3) {
                        font-size: 15px;
                    }


                }

                .back,
                .backinner {
                    background-color: #ff6600;
                    display: flex;
                    flex-direction: column;
                    justify-content: center;
                    align-items: center;

                    .backinner {
                        transform: rotateY(-180deg);

                        :nth-child(1) {
                            margin-bottom: 9px;
                            font-size: 18px;
                            color: #333;
                        }

                        :nth-child(2) {
                            margin-bottom: 20px;
                            color: #ffffff;
                            line-height: 2.5;
                            font-weight: 400;
                        }

                        .more {
                            :hover {
                                background-color: #333333;
                                color: #ffffff;
                                transition: .3s;
                            }

                            span {
                                display: block;
                                width: 120px;
                                height: 40px;
                                line-height: 40px;
                                text-align: center;
                                background-color: #ff8939;

                                a {
                                    font-size: 14px;
                                }
                            }
                        }




                    }
                }
            }



        }

    }

}


// 第二部分
.section-02 {
    height: 387px;
    background: url('../img/td-bg.jpg') no-repeat;
    background-size: 100%;
    background-position: 0 -328px;
    display: flex;
    justify-content: center;
    align-items: center;

    span {
        margin-right: 130px;
        padding: 20px;
        display: flex;
        flex-direction: column;

        p {
            color: #ffffff;
        }

        img {
            margin: 5px auto;
            width: 48px;
        }

    }
}

// 第三部分
.section-03 {
    padding: 90px 30px 100px 30px;
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    justify-content: center;

    .title {
        margin: auto;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        :nth-child(1) {
            margin-bottom: 16px;
            height: 41px;
            line-height: 41px;
            font-size: 32px;
            color: #333;
        }

        :nth-child(2) {
            margin-bottom: 20px;
            height: 34px;
            line-height: 34px;
            font-size: 15px;
        }

        :nth-child(3) {
            margin-bottom: 30px;
            width: 206px;
            border-bottom: 2px solid #ff6600;
        }
    }

    ul {
        margin: 0 auto;
        margin-bottom: 70px;
        width: 1313px;
        display: flex;
        flex-direction: row;
        justify-content: space-between;

        li {
            margin: 20px;
            width: 33.33%;
            background-color: #fff;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;

            &:hover {
                .pass {
                    z-index: 2;
                    transform: rotateX(180deg);
                    transition: .5s;
                }
            }

            :nth-child(1) {
                position: relative;

                .current {
                    backface-visibility: hidden;
                    transition: all .5s ease;
                    z-index: 1;



                }

                .pass {
                    position: absolute;
                    top: 0;
                    left: 0;
                    width: 400px;
                    height: 267px;
                    background-color: #ff6600;
                    color: #ffffff;
                    display: flex;
                    flex-direction: column;
                    justify-content: center;

                    .passinner {
                        transform: rotateX(-180deg);

                        :nth-child(1) {
                            font-size: 18px;
                            text-align: center;
                            line-height: 1.5;
                            font-weight: 500;
                        }

                        :nth-child(2) {
                            margin-top: 10px;
                            font-size: 12px;
                            text-align: center;
                        }
                    }


                }
            }

            .text {
                padding: 30px 25px 20px 25px;
                display: flex;
                flex-direction: column;

                :nth-child(1) {
                    font-size: 24px;
                    line-height: 36px;
                    margin-bottom: 9px;

                    :hover {
                        color: #ff6600;
                    }

                    a {
                        color: #333;
                    }
                }

                :nth-child(2) {
                    font-size: 12px;
                }

                :nth-child(3) {
                    margin-top: 20px;
                    border-bottom: 1px solid #eae8e8;
                }

                :nth-child(4) {
                    margin-top: 20px;
                    font-size: 15px;
                }
            }


        }
    }

    .look_more {
        margin: auto;
        width: 1210px;
        display: flex;
        justify-content: center;

        span {
            margin-bottom: 20px;
            // width: 33.33%;
            flex: 1;
            border-bottom: 2px solid #fff;
        }

        :nth-child(1) {
            margin-right: 23.391px;

        }

        .more {
            :hover {
                background: #ff6600;
                transition: .3s;
            }

            p {
                width: 316.359px;
                padding: 13px 29px;
                height: 17px;
                height: 17px;
                line-height: 17px;
                font-size: 14px;
                flex: 1;
                text-align: center;
                display: flex;
                justify-content: center;
            }

        }

        .current {
            width: 300px;
            padding: 10px 29px;
            text-align: center;
            height: 17px;
            line-height: 17px;
            background: #ff6600;
        }


    }
}

// 第四部分
.section-04 {
    padding: 95px 30px 70px 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;

    .title {
        margin: auto;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        :nth-child(1) {
            margin-bottom: 16px;
            height: 41px;
            line-height: 41px;
            font-size: 32px;
            color: #333;
        }

        :nth-child(2) {
            margin-bottom: 20px;
            height: 34px;
            line-height: 1.7;
            font-size: 15px;
        }

        :nth-child(3) {
            margin-bottom: 30px;
            width: 206px;
            border-bottom: 2px solid #ff6600;
        }

        :nth-child(4) {
            margin-bottom: 20px;
            font-size: 15px;
            text-align: center;
        }
    }

    .cooper-partner {
        margin: 20px auto;
        padding-top: 46.797px;
        width: 1170px;
        color: #333333;
        font-size: 20px;
        text-align: center;

        span {
            color: #333;
            font-size: 20px;
            font-weight: 700;
        }
    }

    ul {
        margin: auto;
        width: 1170px;
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;

        li {
            width: 20%;
            display: flex;
            justify-content: center;



        }

    }
}